You observe the lower limb of the Sun at a sextant altitude (hs) of 24°00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?

Question

You observe the lower limb of the Sun at a sextant altitude (hs) of 24&deg;00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?

Accepted Answer

Option C: 24&deg;10.2'. Applying Bowditch procedures, an index error 'off the arc' is added to sextant altitude. The dip correction for a 55-foot height of eye is subtracted to find apparent altitude. Adding the lower limb semidiameter and applying refraction yields Ho 24&deg;10.2'.

You observe the lower limb of the Sun at a sextant altitude (hs) of 24&deg;00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?

You observe the lower limb of the Sun at a sextant altitude (hs) of 24°00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?